A Microstrip Bandpass Filter Using Asymmetrical Stepped-Impedance Resonators for a Wide Upper Stopband Performance

Akkaraekthalin, Prayoot; Jantree, Jaruek; Majaeng, T.; Chaimool, Sarawuth

doi:10.1109/rws.2007.351787

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…In the RF front-end, the bandpass filters with wide stopband and high selectivity are designed to enhance the overall system performance. The stepped impedance resonators (SIRs) have been found suitable owing to their good stopband performance [1][2][3][4][5][6][7][8]. One of the key features of the SIR is that its resonant frequency can be adjusted by its impedance ratio.…”

Section: Introductionmentioning

confidence: 99%

Method of determining feed positions in coupled half-wavelength stepped impedance resonator bandpass filter

Han

Chen

et al. 2009

IET Microw. Antennas Propag.

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In this study, the input impedance of coupled half wavelength stepped impedance resonator bandpass filter with directly tapped feed structure is deduced, and the method of determining the feed positions in the filter is proposed by using the concept of impedance matching. Two microstrip bandpass filter examples are described for demonstrating the procedure. The simulated and measured results indicate that the proposed method is an effective way for designing similar filters.

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Section: Introductionmentioning

confidence: 99%

Method of determining feed positions in coupled half-wavelength stepped impedance resonator bandpass filter

Han

Chen

et al. 2009

IET Microw. Antennas Propag.

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A Novel Compact Stepped-Impedance Resonator Lowpass Filter

Wang

Gao

Yang

et al. 2008

2008 China-Japan Joint Microwave Conference

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A novel stepped-impedance resonator (SIR) and its Fig.l(c) shows the simplified equivalent circuit of the simplified equivalent circuit are proposed in this paper. The SIR. Zin and Yin denote the input impedance and the frequency responses of the SIR with different sizes are input admittance looking into the microstrip line of W3. analyzed by the full-wave electromagnetic (EM) simulator. A According to the odd-mode and even-mode theory[9], novel low-pass filter (LPF) with two transmission zeros is the odd-mode and even-mode resonant frequencies can designed and fabricated based on the SIR. The measured 3 dB be odd-moded byn-he resong frmula(I)an cutoff frequency fc is 7.2 GHz with 0.3 dB ripple level in the be calculated by the following formula(l)and pass-band. The rejection bandwidth of the insertion loss more formula(2),where n=1,2,3,..., c is the speed of light in than 15 dB is 9 GHz. The experimental results show good free space. agreement with simulated ones, which validates the (2n -

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A Microstrip Bandpass Filter Using Asymmetrical Stepped-Impedance Resonators for a Wide Upper Stopband Performance

Cited by 2 publications

References 8 publications

Method of determining feed positions in coupled half-wavelength stepped impedance resonator bandpass filter

Method of determining feed positions in coupled half-wavelength stepped impedance resonator bandpass filter

A Novel Compact Stepped-Impedance Resonator Lowpass Filter

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